74157: Quad 1-of-2 Data Selector

This is a four-pole double-throw data selector. All four switches are simultaneously enabled or selected.

If the Enable input is high, all outputs will be low, regardless of the input data.

If the Enable input is low, and the Select input is low, the A inputs will provide an output.

If the Enable input is low and the Select input is high, the B inputs will provide an output.

Note that this is a data selector and not a distributor. There are two inputs that may be selected to provide one output.

Pinout
Pin # Pin Assignment
1 Select
2 Input 1A
3 Input 1B
4 Output 1
5 Input 2A
6 Input 2B
7 Output 2
8 Ground
9 Output 3
10 Input 3B
11 Input 3A
12 Output 4
13 Input 4B
14 Input 4A
15 Enable
16 Power (+5V)

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